For Calvin and Knox "this meant that at a stroke the Reformed Church cut itself loose from the entire mass of Latin hymns and from the use of hymnody in general, and adopted the Psalms of the Old Testament as the sole medium of Church praise." Hence forth to be a Calvinist was to be a Psalm-singer.For some 2.5 cen¬≠turies the Reformed churches as a rule sang nothing but the Psalms in worship (http://www.swrb.com/newslett/FREEBOOK/RefWorsh.htm).